Impala 2015 engine off sometimes and harsh engagement on transmission

Laut Technical Support Specialist Philippines Posted   Edited  
2015 Chevrolet Impala Limited LS 3.6L (3 LFX) 6-spd (6T70)
U0101 — Lost Communication with TCM
Harsh Engagement On Transmission

Car sometimes off and harsh engagement when dtc u0101-00 various module no communication with tcm, when clear dtc the car good sometimes 5 or 1 week... please help we already clean all module connectors. then same problem when check engine light comes and the problem come until you clear dtc thats time the car ok for few days.